The Association of Professional Genealogists, established in 1979, is an international organization that supports professionals in genealogy-related businesses. APG encourages genealogical excellence, ethical practice, mentoring and education. The organization also supports the preservation and accessibility of records useful to the fields of genealogy and history. Members of APG agree to abide by a code of ethics (www.apgen.org/ethics) in their profession.
From the Library of Congress. Small items that are too fragile to circulate on interlibrary loan are usually supplied through a photocopy. But photocopying often shortens the life of the original. Recently, the Library of Congress Loan Division began digitizing this type of material and delivering the images over the Internet. This makes the items widely accessible for current and future requests and contributes to the preservation of the original.
This site contains a BASIC introduction to searching on the Library of Congress Catalog along with seven questions and answers to test your skill. Intended for those not familiar with searching card catalogs.