The book has appeared in 1998 in Springer's series "Perspectives in Mathematical Logic", with ISBN 3-540-51700-6. However, Springer's webpage apparently does not know that this book exists, while Amazon informs us that the book is out of print.
The introduction (including a table of contents) is available as a dvi file and Postscript file.
Peter Komjath has written a Review of 'Proper and improper forcing' for the March 2000 issue of the Bulletin of Symbolic Logic, which is available as a Postscript file.
We plan to make some corrections and additions available here.
For the moment, there is only one major "typo" to be pointed out: Please ignore section 8 of chapter III (Souslin's and Kurepa's hypothesis). The material there is treated in a better way in section 8 of chapter V.
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