As Reybach points out in his post about Sly & The Family Stone’s Greatest Hits album, the sleeve for the band’s 1969 single “Thank You (Falettinme Be Mice Elf Agin)” / “Everybody Is A Star” uses Burko.
Burko was designed by Chicago-based designer David L. Burke in October 1967, initially in a Bold weight, and released locally later that year. By 1969, it was revised and expanded to nine styles for Headliners. This exclusively typographic sleeve features the boldest weight, Burko Gorpo, in early use.
The nowadays more commonly known Blippo Black was conceived by Joe Taylor as a weight extension of Burko Bold and released by FotoStar/Facsimile Fonts, also in 1969. Burko Gorpo is different in a number of small details, compare to the glyph set for Blippo Black. Among Burko Gorpo’s unique features seen here are the F with stencil bridge, the wide L, the V with flat (but narrow) base, and the gas-pipe Y. Overall, Burke’s design is a tad wider than the follower.
[More info on Discogs]