Creighton's Ants of North America Online

Antbase.org is providing online access to Creighton's classical study on
the North American ants. Be advised this is a large download and will take alot of time on a slow connection.    Ants of North America

Or as single pages in the form of
http://research.amnh.org/entomology/social_insects/ants/publications/622
4/6224_xxxx.pdf

Whereas xxxx is the actual page number, such as page number 65 would
transfer into 6224_0065.pdf.

Other publications can be found at
Additional publications

Links are provided from citations within antbase to single pages of all
the listged publications, at the moment ca 750, and over 2,000 to come.