BiblioVault may have an electronic file which would meet your requirements for this title:
The Indian Militia and Description of the Indies
Captain Bernardo de Vargas Machuca, Kris Lane, Timothy F. Johnson, Neil L. Whitehead, Jo Ellen Fair and Leigh A. Payne
Paper: 978-0-8223-4314-1
Cloth: 978-0-8223-4297-7
Electronic: 978-0-8223-8906-4