Once you find the original imports you have to go to the studbooks of the 
country or the on-line world Arabian studbook. There are some well known 
reference works that anyone doing research should have, Carol Mulder's 
books on Imported Foundation Stock (Vol 3 is about to be published) are 
essential. What other materials you will need depends on the bloodlines 
you are researching. 
I breed CMK Arabians so I have lots of info on Crabbet, Maynesboro, the 
Hearst importation and the Davenport importation. I also subscribe tothe 
Crabbet Influence Magazine and have compiled an index of the magazine 
that lists all the articles by title and by author, all the pictures of 
every horse with stud book references and all teh advertisers. I used 
that to look up the info on Lewisfield stud.
For a sampling of what's available as research material call one of the 
rare book sellers who specialize in Arabian horse books and ask for a 
catalog. You can spend as much ore more $ on teh books as you can on the 
horses! <g> There are references on Spanish, Polish, Russian, Al Khamsa, 
Davenport, CMK, GSB, and just about every specialized group there is. 
Right now my rather modest research library has only about 100 books. I'm 
slowly building a larger one though.
If you don't wish to buy your own materials then you can always go to 
Denver to the Arabian Horse Trust and use their library. That's the only 
place to look at historical photos, film and video, read the breeders 
scrapbooks and they also have some of the more rare books that would be 
prohibitively expensive to own.
There is a group of Arabian Horse Historians who have regular meetings 
and share information about sources. They have also reprinted some of the 
more rare references. I purchased a reprint of the Maynesboro catalog 
from them but my recent letters have gone unoticed.
Once you know the pedigree you need more information about the horse 
itself. Breeder diaries can give a hint into the temperment and stamina 
of the horses. Unfortunately IAHA does not keep records in a format that 
is readily searchable so it's hard to get show and trail ride records on 
the animals. I try to enter in awards as reported in AERC newsletter, the 
NATRC newsletter and in the general Arabian press about distance horses 
in my DB so that the info is there. The Arabian Jockey Club is keeping 
typical racing data on Arabian who race or sire or produce race horses. 
You can buy some reports from them but I haven't looked into it much. 
The U.S. Cavalry kept some records on endurance/distance rides and some 
of them were won by purebred Arabians so you can track some of the horses 
that way.
I also try to flag pictures and info that I see that I may want to refer 
to later. One of my on-going projects is the development of a multimedia 
database/CD-ROM of all the CMK horses and their descendents. I'm 
constantly soliciting pictures and materials and working on the project. 
I'm posting this to the endurance list since even though it's not 
specifically about endurance it is important for breeders of endurance 
animals to be able to look back at where the horses came from. 
Oogie McGuire - oogiem@dsrtweyr.com
Weyr Associates - Multimedia and Web Authoring Services & Consulting
Desert Weyr - CMK Arabian horses & saddle mules for endurance and show
Voice (619) 788-6671     FAX (619) 788-6742
http://www.dsrtweyr.com/~desertweyr/