The 22-year-old made Remnants of War as part of a project with the Northern School of Art.
He took pictures of concrete pill boxes that were manned by soldiers and anti-tank blocks still visible locally.
Joshua launched the book at a World War Two event at the Heugh Battery Museum where he is a regular volunteer on Saturday.
He said: “After the war a lot of the defences were demolished but a handful remain.”
Joshua performs guided museum tours for visitors and helps with school visits.
The museum published the book which is on sale in its gift shop along with new postcards of the site taken by Joshua.
Manager Diane Stephens said: “We are very proud of him and the contribution he makes to the museum, along with everyone on the volunteer team.”
Remnants of War is priced £5 and proceeds go to the museum.