Not complete, but all I have at the moment. Feel free to email me a scan if you have a cover I don't, or a better copy of the ones I got from photocopies.
Dance sing and Listen (1963) front
Dance sing and Listen Again (1963) front back
Dance sing and Listen Again and Again (1963) front
The Way Out Record for Children (1968) front back
The Electronic Record for Children (1969) front back
Together (1971) front back
Captain Entropy (1972) front
Dance to the Music (1972) front back
This Old Man (1975) front
Ebenezer Electric(1976) front back
Although it's not a Dimension 5 release, here's the cover of The Electric Lucifer LP, and also the back cover and its copious notes (although they're not so easy to read ).
This page updated Dec. 23, 1999 by lara7.