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Edited by Andre Bouwman

Codices Hugeniani Online (COHU) offers the fully digitized archive of Christiaan Huygens (1629 - 1695), held at Leiden University Library. The archive includes notebooks and loose leafs with texts in the field of astronomy, mechanics, mathematics and music, as well as correspondence and annotated books.

Huygens was a prominent Dutch mathematician, astronomer and physicist. He published major studies on mechanics and optics, and a pioneer work on games of chance. He is famous for his discovery of the rings of Saturn and its moon Titan, and for inventing the pendulum clock.

Shortly before his death in 1695 Huygens bequeathed a large part of his scholarly papers to Leiden University Library. After 1800, the legacy was further enriched by manuscripts and letters from family property, amongst others a large number of letters from Huygens' father Constantijn (1596 - 1687).

For over three centuries, many scholars have made the Codices Hugeniani the object of their research. The contents of the archive have been made partly accessible through the well-known Oeuvres complètes (a 19-volume 19th Century reference work). More recently, the Codices Hugeniani were described in detail by Dr. Joella Yoder in her Catalogue of the Manuscripts of Christiaan Huygens (Brill, 2013). With COHU the full archive's contents are now easily accessible for the first time.

Features and benefits

Sections COHU is logically organized in the same way as the original archive, i.e. 52 codices as main entrances, enabling an overview of the archive as a whole.

Advanced search options In each codex the scans are offered in smaller groupings ranging from 1 to several dozen folios each. These groupings are all described with detailed metadata. This offers the possibility of an advanced search for specific topics, etc.

Rich metadata
For a large part the metadata are taken from Joella Yoder’s catalogue. This is the most authoritative overview and the outcome of 20+ years of hard work. The book contains valuable information about the archive that is not in the Leiden University Library's catalogue.

Direct link between famous Oeuvres complètesand archive
The COHU metadata offer a concordance between the physical archive and the Oeuvres complètes.

Various Authors & Editors

This collection, based on the extensive holdings of Radio Free Europe in Munich and the Polish Library POSK in London, offers unique primary source materials representing a very wide range of opposition and dissident periodicals up to 1988, the year in which many oppositional publications started to appear more or less openly.

The collection is also included in the Polish Independent Publications, 1976- collection.

Various Authors & Editors

This collection, based on the extensive holdings of Radio Free Europe in Munich and the Polish Library POSK in London, offers unique primary source materials representing a very wide range of opposition and dissident periodicals up to 1988, the year in which many oppositional publications started to appear more or less openly.

The collection is also included in the Polish Independent Publications, 1976- collection.

Various Authors & Editors

This collection, based on the extensive holdings of Radio Free Europe in Munich and the Polish Library POSK in London, offers unique primary source materials representing a very wide range of opposition and dissident periodicals up to 1988, the year in which many oppositional publications started to appear more or less openly.

The collection is also included in the Polish Independent Publications, 1976- collection.

Various Authors & Editors

This collection, based on the extensive holdings of Radio Free Europe in Munich and the Polish Library POSK in London, offers unique primary source materials representing a very wide range of opposition and dissident periodicals up to 1988, the year in which many oppositional publications started to appear more or less openly.

The collection is also included in the Polish Independent Publications, 1976- collection.
Rural and Regional Development
Africa
Collection composed primarily of official and semi-official material, published or unpublished issued by governmental agencies on the local and national levels, international and private voluntary organizations and academic institutions. Includes documents such as applications for financing, project appraisals, plans, work programmes and evaluations. These documents, which constitute basic tools for development planners, rarely come under bibliographic control nor can they be readily acquired through conventional commercial channels.

This collection is also included in the Rural and Regional Development collection.
Rural and Regional Development
Europe
Collection composed primarily of official and semi-official material, published or unpublished issued by governmental agencies on the local and national levels, international and private voluntary organizations and academic institutions. Includes documents such as applications for financing, project appraisals, plans, work programmes and evaluations. These documents, which constitute basic tools for development planners, rarely come under bibliographic control nor can they be readily acquired through conventional commercial channels.

This collection is also included in the Rural and Regional Development collection.
Rural and Regional Development
Pacific
Collection composed primarily of official and semi-official material, published or unpublished issued by governmental agencies on the local and national levels, international and private voluntary organizations and academic institutions. Includes documents such as applications for financing, project appraisals, plans, work programmes and evaluations. These documents, which constitute basic tools for development planners, rarely come under bibliographic control nor can they be readily acquired through conventional commercial channels.

This collection is also included in the Rural and Regional Development collection.
Rural and Regional Development
South East Asia
Collection composed primarily of official and semi-official material, published or unpublished issued by governmental agencies on the local and national levels, international and private voluntary organizations and academic institutions. Includes documents such as applications for financing, project appraisals, plans, work programmes and evaluations. These documents, which constitute basic tools for development planners, rarely come under bibliographic control nor can they be readily acquired through conventional commercial channels.

This collection is also included in the Rural and Regional Development collection.

Various Authors & Editors

Russian Emigré Journals, 1855-1917
From the International Institute of Social History

Journals and newspapers published abroad by different political parties and groups such as the Russian Social-Democrats (RSDRP) and Party of Socialist-Revolutionaries (Esery). Collection based on the bibliography by Tatiana Ossorguine-Bakounine entitled L'Emigration Russe en Europe, Catalogue collectif des périodiques russes 1855-1940 and on the collection held by the International Institute of Social History in Amsterdam.