These are from 3.5 edition and before:
Angel, Deva, Monadic Fiend Folio
Aoa, Droplet FF
Aoa, Sphere FF
Apparition Tome of Horrors
Argent Spider WOTC website
Devourer Monster Manual
Dharculus Planar Handbook
Dragon, Ectoplasmic WOTC website
Dragon, Ethereal Draconomicon
Dwarf, Aleithian WOTC website
Ecto Fragments WOTC website
Ectoplasmic Vermin GhostWalk
Elemental, Ectoplasm Elemental, Elder WOTC website
Elemental, Ectoplasm Elemental, Greater WOTC website
Elemental, Ectoplasm Elemental, Huge WOTC website
Elemental, Ectoplasm Elemental, Large WOTC website
Elemental, Ectoplasm Elemental, Medium WOTC website
Elemental, Ectoplasm Elemental, Small WOTC website
Elf, Ghost Dragon 313
Ephemeral Swarm MM3
Ether Scarab MM2
Ethereal Defiler MM5
Ethereal Destrier MM
Ethereal Doppleganger MM2
Ethereal Filcher MM
Ethereal Marauder MM
Ethereal Ooze FF
Ethereal Rat TOH
Ethereal Slayer MM2
Ethergaunt FF
Ethergaunt, Black FF
Ethergaunt, Red FF
Ethergaunt, White FF
Ghost MM
Ghost Eater GW
Ghostly Dragon Template Drac
Gingwatzim, Eoluzim Dr 295
Gingwatzim, Graegzim Dr 295
Gingwatzim, Maronzim Dr 295
Gingwatzim, Naranzim Dr 295
Gingwatzim, Pakim Dr 295
Living Ferroplasm WOTC
Nethersight Mastiff MM2
Nilshai Unapproachable East
Nishruu Monsters of Faerûn, Lost Empires of Faerûn
Phantom TOH
Planetouched, Shyft FF
Poltergeist TOH
Psionic Elemental, Elder TOH
Psionic Elemental, Greater TOH
Psionic Elemental, Huge TOH
Psionic Elemental, Large TOH
Psionic Elemental, Medium TOH
Psionic Elemental, Small TOH
Sacred Watcher BoED
Shedu FF
Spectral Troll TOH
Thought Eater Expanded Psionic Handbook
Thought Slayer XPH
Wizshade Bestiary of the Realms Vol 1 (MC7, MCA4, Volos Guide to Magic)
Xill MM