The Muster Rolls are located at the Texas General Land Office Archives. Images of the 1835-1836 Muster Rolls (that have been recovered) can be seen at TXGenWeb Texas Muster Rolls. Only those relevant to the Siege of Bexar are shown here, but check TXGenWeb and the Texas USGenWeb Archives in case one was missed.
Seige of Bexar
Muster Roll of Capt F.L.F. Parrotts Co. Artillery in camp before Bexar Nov 23rd 1835
Muster Roll Captain Cheshires Company Volunteers in the army before Bexar 1835
Muster Roll Capt Yorks Co Volunteers while in the army before Bexar 1835
Muster roll “New Orleans Greys” Capt Wm G Cooke in the army before Bexar 1835
Muster roll, Capt Thomas W Bruce’s Co Texas in the army before Bexar 1835