Agreed! Here's a quick and dirty list of the twofers containing the Prestige, Riverside, and New Jazz sessions under his name from 1959-1969:
Black Coffee (Milestone MCD 47072):
November 8, 1962 - Black Coffee (Riverside RLP 442)
1963 - Mr. Wonderful (Riverside RLP 466)
Good 'Nuff (Prestige PRCD 24282-2):
June 12, 1962 - Johnny Hammond Cooks With Gator Tail (Prestige PRLP 7239)
May 7, 1965 - The Stinger (Prestige PR 7408)
Legends Of Acid Jazz (Prestige PRCD 24177-2):
May 19, 1969 - Soul Talk (Prestige PR 7681)
December 22, 1969 - Black Feeling! (Prestige PR 7736)
Legends Of Acid Jazz: Soul Flowers (Prestige PRCD 24235-2):
September 27, 1967 - Soul Flowers (Prestige PR 7549)
January 31, 1968 - Dirty Grape (Prestige PR 7564)
Open House (Milestone MCD 47089):
1963 - Open House! (Riverside RLP 482)
1963 - A Little Taste (Riverside RLP 496)
Opus De Funk (Prestige PRCD 24291-2):
February 14, 1961 - Stimulation (Prestige PRLP 7203), Opus De Funk (Prestige PR 7420)
May 12, 1961 - Stimulation (Prestige PRLP 7203), Opus De Funk (Prestige PR 7420)
The Soulful Blues (Prestige PRCD 24244-2):
March 3, 1967 - Gettin' Up (Prestige PR 7494)
June 18, 1968 - Nasty! (Prestige PR 7588)
Talk That Talk (Prestige PRCD 24151-2):
April 22, 1960 - Talk That Talk (New Jazz NJLP 8241)
October 14, 1960 - Gettin' The Message (Prestige PRLP 7217)
That Good Feelin' (Prestige PRCD 24164-2):
September 11, 1959 - All Soul (New Jazz NJLP 8221)
November 4, 1959 - That Good Feelin' (New Jazz NJLP 8229)