"Digital Collections is the 
National Library of Medicine's free 
online archive of biomedical books and videos. All of the content in 
Digital Collections is freely available worldwide and, unless otherwise 
indicated, in the public domain. Digital Collections provides unique 
access to NLM's rich, historical resources.
About the Collections
Texts
The majority of the texts within Digital Collections were digitized 
at NLM using a Kirtas KABIS III scanning system, which produces several 
files per page and per book.  After cropping, deskewing and reviewing 
the source images, additional image derivatives and metadata are then 
created using NLM-defined scripts.   A smaller number of texts were 
digitized from original or microfilm by a vendor offsite.
The texts comprising the 
Medicine in the Americas
 collection were digitized for a multi-institutional digital library 
project, the Medical Heritage Library, which uses Internet Archive to 
host its collection.  Therefore NLM routinely deposits copies of its 
digitized books to 
Internet Archive.  More information on the Medical Heritage Library can be found 
here.
Films
The films available in Digital Collections come from NLM's reel and 
videotape holdings of government and military-created productions.  The 
source material was digitized to MPEG2 format, which served as the 
digital master for the range of video derivatives offered by the 
repository. Each film was manually transcribed, with time-coded captions
 then created using WGBH's Magpie application."

Ernster, the Virtual Library Cat