Museum Optischer Instrumente: A wonderful collection of early German microscopes.
Mikroskop-Museum: Another German site devoted to antique microscopes.
Bononiaemicroscope: The collection of the Oris group of Italian collectors.
The Golub Collection: Microscopes from the 17th to 20th centuries.
Origin and Development of the Light Microscope: An outstanding illustrated history of the microscope.
A Short History of the Early American Microscopes by D. J. Padgitt: This long out of print book is a valuable classic reference
Die Mikroskope von Simon G. Plössl : Microscopes made by Simon Georg Plõssl (1794-1868).
Giovanni Battista Amici (1786-1863): The Italian optical instrument maker (Instruments at the Scuola Normale Superiore).
Jeroen Meeusen: A private collection of interesting French microscopes.
Science Museum, London: Some microscopes in the collection and related information.
Optik Online-Virtuelles Museum: A collection of mostly German microscopes.
The Billings Microscope Collection: The collection of the Medical Museum of the Armed Forces Institute of Pathology.
The Nachet Collection: The long out of print catalog of this famous collection.
George's Microscopy Pictures: Photographs of vintage microscopes.
Molecular Expressions Museum of Microscopy: Images and descriptions of antique microscopes.
Collection of Historical Scientific Instruments-Harvard University: Microscopes in the collection. Enter "microscope" in the search box."
Museum of the History of Science Oxford: Some microscopes in the collection (browse or use the search box).
Teylers Museum Netherlands: Some microscopes in the collection.
The Lundy Antique Microscope Collection: American and European microscopes.
National Museums Scotland online collections database: Some microscopes from the museum collection.
Willkommen im virtuellen Museum der Wissenschaft-Historische Mikroskope: Some microscopes from the museum collection.
The Moody Medical Library's Collection of Historical Microscopes: Microscopes from the 18th to 20th centuries.
The Lentz Microscopy and Histology Collection at Yale University: Some microscopes and slides in the collection.
Museo Galileo - Institute and Museum of the History of Science-Florence Italy: Microscopes in the collection.
La Fondazione Scienza e Tecnica-Florence Italy: Some microscopes in the collection.
Planetarium Zuylenburgh, Netherlands: Microscopes in the collection.
Microscopes at the Real Academia Nacional De Medicina (Spain): Microscopes in the collection (text in Spanish).
Stichting voor Historische Microscopie (Foundation for Historical Microscopy): A collection of historical microscopes from 1680 (in Dutch).
Muséée des Arts et Métiers, Paris: Some microscopes in the collection. (Type the word "microscope" in the search box)
The National Museum of American History: Some microscopes at the Smithsonian.
Colección de Instrumentos Cientóficos: G. Crovetto. A private collection. In Spanish.
Spencer Microscopes A site devoted to the microscopes made by the Spencer Lens Co. and the American Optical Co.
Histoire des Projections Lumineuses: A site devoted the history of projection apparatus including a section about solar and projection microscopes.
The Leitz Collection and Optical Museum : Leitz microscopes, Leica cameras, etc. from the early to mid 20th century.
Universidad de Salamanca-Museo de Microscopia: Microscopes in the collection (in Spanish).
Le Compendium : A French site devoted to antique optical (including microscopes) and physics apparatus.
Microscope History: A collection of microscopes from the 18th-20th centuries.
East Carolina University : Historic microscope collection.
Microscopios antiguos del s.XIX: A collection of 19th century microscopes from various locations.
A Cabinet of Curiosities : Antique Microscope Slides from the Victorian Era c. 1830s - 1890s.
Historical Makers of Microscopes and Microscope Slides : The title of the website says it all.
Scientific Trade Catalogs in the Smithsonian Collection : Microscope-related catalogs. Many can be downloaded.
Online Scientific Instrument Trade Catalogues : A list of links to online scientific and medical instrument maker catalogs.
Science-info.net - Documentation : A compilation of 19th and 20th century catalogs in pdf format. Zeiss, Leitz, and others.
Little Imp Suite of Books and Catalogues on Microscopes / Microscopy: Courtesy of Steve Gill, and hosted on Microscopy-UK..
Webster's Instrument Makers Database: A useful database of scientific instrument makers.
Oesper Museum Booklets on the History of Chemical Apparatus: Spectroscopes, refractometers, colorimeters, etc.
Antique Microscopes on Facebook: Interesting highlights about early microscopes.