I found these at an estate sale - I do not know much about them

Congo expo67 

Maldives Islands expo67 (World Fair, Montreal 1967)

Romania 1950 Philatelic Expo (both were hinged) one used?

Dominican Republic (1956 Olympics) 1957? - two sheets (5 & 3 stamps) no perforations - UNRWA REFUGIADOS overprints (Palestine refugees)  - ONE WITH 5 STAMPS HAS SLIGHT CORNER BEND

LITHUANIA 1939 SOUVENIR SHEET USED METROPOLIS LITHUANIAE RECUPERATA (multiple hinge stains on back)

jsb 151