Great Lost Lps...

Here's some:

Spirit- "Twelve Dreams" looks like it's not lost

Gino Vanelli- add "Pauper in Paradise" and "Brother to Brother"

PFM- "Photos of Ghosts" and "The World Became The World"

The Strawbs- "Grave New World", Bursting at the Seams" and "Hero and Heroine"

Jean-Luc Ponty- "Enigmatic Ocean"

Larry Cartlon- "Friends"

Steve Khan- "Blue Man"

Phil Manzanera- "Listen Now"

10cc- "How Dare You"

Forgot one.
Curved Air- "Phantasmagoria"

Gentle Giant- "Octapus"
801- "Listen Now!"
This Mortal Coil- "Blood"
Michael Brook- "Albino Aligator"
Pieter Nooten/Michael Brook- "Sleeps With The Fishes"
Laurie Anderson- "Strange Angels" , "Home Of The Brave"
Robyn Hitchcock- "I Often Dream Of Trains"
Julee Cruise- "Floating Into The Night"
Ryuichi Sakamoto- "Sweet Revenge"
Joni Mitchell- "Miles Of Aisles"
Peter Hammil- "The Silent Corner & The Empty Stage"
Van Der Graaf Generator- "Godbluff" , "Still Life"
David Bowie- "Low" , "Lodger"
Jefferson Airplane- "After Bathing At Baxter's"
Love- "Forever Changes"
Frank Zappa- " Apostrophe '"

George

Savoy Brown - A Raw Sienna
Robin Trower- Bridge of Sighs
Santana III (not nearly as overplayed as 1+2)
Stanley Clarke - School days
Dr John - Gris Gris

Byrds-Sweetheart of the Rodeo
Pure Prarie League-Bustin Loose
Ry Cooder-Paradice and Lunch, Boomer's Story, Jazz, Chicken Skin Music
Brewer and Shipley-Tarkio Road
Cat Stevens-Mona Bone Jakon
Nitty Gritty Dirt Band-Will the Circle Be Unbroken, Gold, Silver, and Dust
Ozark Mountain Daredevils-Men From Earth, Car Over the Lake Album, Self Titled
Jimmy Buffet-Changes in Latitude Changes in Attitude
Chicago-6
Talking Heads-Little Creatures
Stevie Ray Vaughn-Texas Flood, Can't Stand the Weather
Molly Hatchet- ST, Flirtin with Disaster
Gentle Giant-In a Glass House
Camel-Moon Madness
Bob Marley-Uprising
Pink Floyd-Meddle
Willie Nelson-Stardust

Sorry, could go on and on but that's more than you probably wanted already.