National Agricultural Library - http://www.nal.usda.gov/speccoll/seedcatalogimagegallery.shtml
Smithsonian Institution - http://www.sil.si.edu/digitalcollections/SeedNurseryCatalogs, http://www.sil/si.edu/SILPublications/seeds/
Cornell University: Liberty Hyde Bailey Hortorium, NY - http://exhibits.mannlib.cornell.edu/mailordergardens/intro.htm, http://bhort.bh.cornell.edu/catalogs.htm
University of Delaware - http://www.lib.udel.edu/ud/spec/guides/hort/seeds.htm, http://www.lib.udel.edu/ud/spec/exhibits/sfc/seed.htm, http://www.lib.udel.edu/ud/spec/exhibits/sfc/index.htm
University of California-Davis - http://www.lib.ucdavis.edu/dept/specol/manu-collections/manuscripts/index.php?collection=632, http://www.lib.ucdavis.edu/dept/specol/manu-collections/manuscripts/index.php?collection=657
Massachusetts Horticultural Society - http://www.masshort.org/MHS-Library
Pennsylvania Horticultural Society - http://www.phsonline.org
Andersen Horticultural Library, MN - http://www.arboretum.umn.edu/librarycollections.aspx
New York Botanical Garden - http://library.nybg.org/NonBookCollection.php
Washington State University - http://www.wsulibs.wsu.edu/holland/masc/finders/cg667.htm
American Antiquarian Society, MA - http://www.americanantiquarian.org/tradecats.htm
Royal Horticultural Society Lindley Library, U.K. - http://www.rhs.org.uk/education-learning/libraries-at-rhs/visit-the-libraries/lindley-library-london
Wageningen UR Library, Netherlands - http://library.wur.nl/speccol/nursery_catalogues/, http://library.wur.nl/speccol/nursery_catalogues/links.html
Royal Botanical Gardens, Hamilton, Ontario - http://www.bgci.org/garden.php?id=98
Project to locate all European seed and nursery trade catalogue collections - http://www.actahort.org/members/showpdf?booknrarnr=634_31
Seed Saver’s Exchange - http://www.seedsavers.org
Joseph Rennie Papers (University of North Carolina) - http://www2.lib.unc.edu/mss/inv/r/Rennie,Joseph.html
Biodiversity Heritage Library - http://www.biodiversitylibrary.org/browse/collection/seedcatalogs