Cheers Terry,
I also love the historical aspect behind the stamps, because to me it expands the dimensions of discovery and joy. Fun to collect an old, well centered stamp to be sure. But "more fun" to have the objective background of what was happening in real life (be it Egpyt or Spain). Your library seems impressive.
Regretfully, I am a one trick pony, collecting only Newfoundland, by design. I began in 1972, when I was 12 and somehow read an article that Newfoundland would go up in value on the simple premise that there were no more stamps being made (ie, 1949 it joined Canada). The same for the other "provinces". So alas, my recommendations would only be in that vein. Having said that:
1. I have a very old Scott but never use it (actually ripped the Newfoundland pages out and threw it away, so I would not be tempted to other countries).
2. The Unitrade Canada Catalogue is solid and, in my opinion, the bible or standard. (Sadly, I just gave away a 5 year old one to a collector at a stamp show, else I would have sent to you).
3. For Newfoundland, I strongly recommend the NSSC. Its incredibly deep and factually driven and I rely upon it consistently. (Walsh and Butt have a 7th edition). There is also one for Canada and the other provinces, but I don't have that one. The NSSC has incredible detail like all railroads, cancel types, post office detail, FFC history and depth for each FFC down to ant level detail. It also has market value prices (not catalog) -- based on their transactions. I use this a lot to snag deals at shows or on the web. For example, I recently bought a cover for $10 because the NSSC indicated that the slogan cancel and the RPO on the back were incredibly rare and worth $90. Another time, I passed on a FFC that some lame guy wanted $200 for (based on his left ear and Scott), when the NSSC indicated it was worth $150. The NSSC also has tons of photos and real examples of variations--which is incredibly useful if you want to actually see a variant. The weakness is that it has a different number system and very small font (you need a microscope!)
4. I also have "The Air Mails of Canada & Newfoundland" which is important, but overlaps with the NSSC.
5. I also have Bogg's History book above (hard to find, out of print). More of a dry history, year by year, than a catalogue
6. Lastly, I have Ludlow's wierd but awesome Railway book published in Japan in like 1962; also hard to find..but definitive on RPOs (and overlaps with the NSSC)
Of all these, if there was a fire in my house, I'd grab my stamps and the NSSC.... here is a link to one
http://compare.ebay.com/like/141000...pes&var=sbarthen if I had time, i'd come back for my wife and the other books