First printed in 1961. Volume I is "General Geology Report 34". Pages 14-267 are the bibliography, while the rest is a copious index by county, subject, and geologic age. Spine ends worn, spine faded. Evidence of repair at hinges. Volume II is "Bulletin G 42", published in 1965, and it is entitled "Annotated Bibliography of Pennsylvania Geology--Supplement to 1959". Contains a short introduction, serial publications cited list, and an index of the same subjects as above. Cloth binding with spine ends bumped, minor wear. Volume III is "Bulletin G 61", published in 1972, entitled as above except "Supplement to 1969". With same divisions as above. Cloth binding with spine ends bumped and minor wear. All volumes with the pencil signature of Gavin Bridson.