Hey! I just read your post about the army sizes of the Seven Kingdoms, and I was wondering how you came to those numbers due to curiosity? Did the books say explicitly, basing it off of region size and local resources, a combination or what? Thanks!

Mainly, I rely on these sources:

1. Specific numbers given in text, or by GRRM himself in associated material, and comparative statements made by GRRM. 
2. Elio’s estimates, which are based off #1 plus discussions with GRRM plus certain rules of thumb used by historians.
3. My own estimates, using other rules of thumb used by historians, and applying them to things like estimates given as to population of the various Seven Kingdoms.