The Best guide to business shareware / Judy Heim, John Heim and Mike Callahan Introduction to American education / Joseph F. Callahan ; Leonard H. Clark Teaching in the middle and secondary schools /Joseph F. Callahan, Leonard H. Clark Dr. File finder's guide to shareware / Mike Callahan Construction project scheduling / Michael T. Callahan, Daniel G. Quackenbush, James E. Rowings Construction project scheduling / Michael T. Callahan, Daniel G. Quackenbush, James E. RowingsLet's go USA : the budget guide to / editor, Michelle C. Sullivan, Megan B. Callahan, Edward Y. Park. -- 1996-Volunteers / Armand Lauffer, Sarah Gorodezky ; with contribution by Jay Callahan and Carla OverbergerCuba and international relation :historical study in America diplomacy /James Morton CallahanWorld's best places [rekaman video suara] : to live out your fantasi/ Prodecer, Linda Callahan ; executive producer, Erik Nelson