Subjek: Ensiklopedia

Encyclopedia Britannica Macropedia Knowledge in Depth 12 : Metamorphic - New Jersey

Encyclopedia Britannica Macropedia Knowledge in Depth 13 : Newman - Peisitratus

Encyclopedia Britannica Macropedia Knowledge in Depth 14 : Peking - Probability

McGraw-Hill Encyclopedia Of Science and Technology 8: MAC-MYX

Encyclopedia Britannica Macropedia Knowledge in Depth 15: Proboscidea - Rubber

McGraw-Hill Encyclopedia Of Science and Technology 7: IBE-LYT

Encyclopaedia Britannica: Ready Reference and Index - X Tirane Zywny

McGraw-Hill Encyclopedia Of Science and Technology 6: GAB-HYS

Encyclopedia Britannica Macropedia Knowledge in Depth 16 : Rubena - Somalia

Encyclopaedia Britannica: Ready Reference and Index - IX Scurlock Tirah