The early version of this book had been finished in 1975. Later I introduced some inserts based on, or related to publications up to 1986.
There are a few persons to whom I would like to express my thanks for their kind cooperation: to Sr. Gabriela Kovacs and Michael Anderson who in the early 1970s, as a graduate student in the Department of Philosophy, helped me greatly in editing the first version of this book; to Mrs. Leta Denton, who edited some inserts in 1986; and especially to Miss Daniela Pintaritsch, who besides editing the final version, also took the responsibility for proofreading.
Among those who typed my manuscript, I should like to give my thanks to Mrs. Sophia M. Dabrowska and Mrs. Rena Browne-Jackson.
I am particularly indebted to Ing. Ivo Pogonowski, who in his generosity, allowed me to use his maps even before they appeared in his Poland, A Historical Atlas, 1987. I thank Hippocrene Books, Inc. for permission to use these maps after they were published. I also wish to thank Schenkeman Book, Inc., for permission to use a longer quote from one of its publications.