I want here to express my thanks and appreciation to Mr. Lessing
J. Rosenwald, through whose kindness this unique Doctrina was
presented to the Library of Congress and with whom the idea of this
publication originated. His interest and enthusiasm made possible
my work, and his friendly advice and encouragement have been both
valuable and heart-warming.
I also wish to thank others who have given me great assistance. They
are Dr. A.S.W. Rosenbach to whom I continually turned for advice,
Dr. Lawrence C. Wroth of the John Carter Brown Library and Dr. Leslie
W. Dunlap of the Library of Congress who very kindly read over my
manuscript and gave me the benefit of their suggestions and criticisms,
Mr. David C. Mearns and Miss Elsie Rackstraw of the Library of Congress
and Mrs. Ruth Lapham Butler of the Ayer Collection of the Newberry
Library who so freely and generously made available to me the great
collections of works on the Philippines in their libraries, Dr. John
H. Powell of the Free Library of Philadelphia who helped me find
reference books of the utmost importance, and the many librarians
who courteously answered written queries about early Philippine
material. EDWIN WOLF 2ND.