Vespasian, the books I have are as follows:
The
Roman Wall: Comprehensive
History and Guide
Frank Graham 1979
ISBN 085983140X
Details the Wall section by section. Comprehensively illustrated
Hadrian's Wall in the days of the
RomansRonald Embleton and Franf Graham
1984/1990
ISBN 0859831779
Section by section. Comprehensively illustrated.
Both published by Frank Graham
Both are what I would call 'popular' rather than 'scholarly' books.
Life and Letters on the
Roman Frontier
Alan K.Bowman 1994
ISBN 0714113891
Discovery and texts of
writing tablets found at the Vindolanda
fort just south of the Wall
Romans in the Lake Counties
Tom Garlick
Dalesman Books 1972
ISBN 0852061706
80 page pamphlet giving details on many of the forts. Includes list of
Fort names.
The best place to obtain out-of-print books in my experience is abebooks.com.
I did an advanced
search on that site with the keywords 'Hadrian' and 'Wall' and it came up with over 1100 books, including most if not all of the above.