Manuscripts already formatted according to the Editorial Guidelines of HUITZIL should be sent via email to migmarti97@gmail.com. In exceptional cases, where the author definitely does not have access to email, manuscript files will be received on diskette sent via normal mail to Dr. Miguel Angel Martínez Morales, Editor en Jefe de HUITZIL, CIB-UAEH, A.P. 69, Pachuca, Hgo., 42001, México.