Howard Pospesel and David Marans, "Arguments: Deductive Logic Exercises" (1978)
Howard Pospesel and David Marans published Arguments: Deductive Logic Exercises in 1978, and the text has long been out of print. The copyright has now reverted to the authors, who have generously made the book available to logic students, teachers, and the general public. Arguments is unique in that it can be used with any system of proofs for first-order predicate logic: truth trees, Fitch-style natural deductions, etc.
The book is available as a single PDF download (44Mb) or broken up in chapters. Click on "Arguments files" to access the PDF scans.
Visitors to this site are also encouraged to peruse David Marans' open-access resource, Logic Gallery, which can be found at http://humbox.ac.uk/3682
To contact the authors send email to davidjan43 — the sign the Germans call a "spider monkey" — aol dot com.