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v. 1. 1971 postal strike posts : Isle of Man authorised postal service (post Manninagh)
v. 2. 1971 postal strike posts : posts beginning with the letter 'A'
v. 3. 1971 postal strike posts : posts beginning with the letter 'B'
v. 4. 1971 postal strike posts : posts beginning with the letter "C"
v. 5. 1971 postal strike posts : posts beginning with letters "D" to "EM"
v. 6. 1971 postal strike posts : posts from "English's" to "Express"
v. 7. 1971 postal strike posts : posts from "Executive services" to "Hunter's post"
v. 8. 1971 postal strike posts : posts from "Inforum" to "Lymington"
v. 9. 1971 postal strike posts : posts from "M" to "O"
v. 10. 1971 postal strike posts : posts from "P" to "R"
v. 11. 1971 postal strike posts : posts beginning with "S"
v. 12. 1971 postal strike posts : posts beginning with "T" to "V"
v. 13. 1971 postal strike posts : posts beginning with "W" to "Z".
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
British private posts, 1680-1980 : a series of handbooks by Clive Smith. ISBN 1901525120. Published by C. Smith in 1997. Publication and catalogue information, links to buy online and reader comments.