Collections & Image Search Engines:
Disneyland Postcard Reference Guide
James M Davis’ Descriptive Catalogue
Collection, Conservation & Preservation:
Book & Paper Conservation Wiki
Caring for Paper (PDF)
Caring for Photographs (PDF)
How a 90-Year-Old Photograph is Professionally Conserved (Video)
Matting & Framing Works of Art & Artifacts on Paper (PDF)
Northeast Document Conservation Center
Aids for Approximating Age:
Abbreviations for US States & Territories
Atlas of Analytical Signatures of Photo Processes
Dating Card Mounted Photographs
Ektacolor Paper Backprint Chronology (PDF)
Guide to Dating Curt Teich Postcards (PDF)
International Encyclopedia of Uniform Insignia
Lipman Postal Cards (PDF)
MetroPostcard Guide to Postal Cards
MetroPostcard Guide to Real Photo Postcards
Notes on Dating Photographic Paper (PDF)
Photograph Identification Guide
Playle’s Real Photo Postcard Stamp Boxes
Playle’s US Postcards by Postage Amount
Books:
The Art of Collecting Photography by Laura Noble
Collecting Photography by Gerry Badger
Collector’s Guide to Early Photographs by O. Henry Mace
The Permanence & Care of Color Photographs by Henry Wilhelm & Carol Brower