The Amelia Williams doctoral thesis A CRITICAL STUDY OF THE SIEGE AND FALL OF THE ALAMO AND OF THE PERSONNEL OF ITS DEFENDERS, published in 5 volumes of the 1933 SOUTHWESTERN HISTORICAL QUARTERLY magazine, has been considered by many to be the first serious 'modern' study of the Alamo story. While the thesis has been both sited and quoted from in almost all the major works on the Alamo, it had never been made available to the general public until now. Here's a link: