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Our eBooks are available in two versions: PDF format and PC-executable EXE format. Unless otherwise specified during the order process, we will send all eBooks in PDF format. If you prefer our EXE format, let us know during the order process and that is what we will send, as long as your email service provider won't block them. Our paperback books in the "Books" category are our diminishing collection of original publications from the 1960's, 1970's and 1980's.