I meant Baird's Manual of American College Fraternities, a standard reference. But yes, there are several other books with great detail about Beta Theta Pi - all very interesting and powerful:
By William R. Baird:
The Handbook of Beta Theta Pi
Forty Years of Fraternity Legislation
A Decade of Fraternity Reconstruction
Beta Letters
Betas of Achievement
Note that "the Handbook" was originally called "Fraternity Studies" but this was confusing because it dealt only with Beta, whereas "Baird's Manual" deals with all fraternities & sororities - it is I think past 20 editions by now.
By Francis W. Shepherdson:
The Beta Book which is Shep's extended edition of Baird's
Handbook
Beta Life
Beta Bards
Beta Lore
By Spig Fawcett:
Marching Along which is Spig's update to Shep's
Beta Book.
And there are others besides, but these you ought to consult first. Fischer was an Assistant Historian; he did one on the Mystics; I seem to recall hearing that he was going to do a companion one on the Alpha Sigma Chi but that never happened. Some is in Baird's books, but not really enough to satisfy. It might make a good research project for a future historian.
Finally, if you want an absolutely amazing and incomparable introduction to the life at Miami in the 1830s and 40s, you ought to read
The Miami Years by W. Havighurst. There are some minor inaccuracies (Hardin was in Union Lit, not Erodelphian) but otherwise it is just wonderful... you can get the electronic version at:
http://www.lib.muohio.edu/my/index.html