1 - All the Arthur Ransome books. I kept ordering them from the library, who didn't have them at first so had to buy them
I wasn't so keen on the "big boat" stories such as Peter Duck or Misse Lee, but the rest were fun and definatley inspirational.
2 - 1970's Scout Handbook and PLs handbook, full of all kinds of articles about camping and tieing knots etc. I bought a new copis of them on e-bay last year and was worried that it would not be as good, but it was better and far more enjoyable that the "dangerous book.." series which just wind me up.
I also bought the Leaders book which was new to me and it was interesting to see where out skip got lots of his ideas from
3 - American book on lightweight camping from the library. It had page after page of things you could do with cooking foil, which was cheap in teh US but still expensive here. I used to drive my mum nutty whe I used up the last bit.