The National Park Service, Heritage Documentation Programs just updated their guidelines for large-format photography for the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER), and the Historic American Landscapes Survey (HALS) (I call them H3) programs. Page 8 is the official specification for HABS digital mount cards. The rest of the eight page PDF re-states the generally accepted equipment and materials for H3 photographs... last updated in 2001.

I have just donated my second documentation of a worthy historic site to the Heritage Documentation Programs (one was a HABS and one a HALS). It's easy once you figure out the fussy washing, labeling and mounting; then send them the prints and negatives. Your film will be stored at 30 degrees F. and 35% Relative Humidity... the perfect home for film, better than my film at home for sure. And everyone worldwide will be able to access scans of the donated photos online on the Library of Congress website.

The new 2011 photo spec document is available here:

http://www.nps.gov/history/hdp/stand...es_Nov2011.pdf