This is their US debut album, with an incredibly impactful cover.
It first appeared on a compilation album in 1968. It contains 12 tracks in total, including the original "Albatross," an instrumental hit in the UK, and "Black Magic Woman," which was later covered by Santana and became a big hit.
The cross-dressing on the cover was done by Mick Fleetwood (drums). This album is a compilation of early hits, including songs from "Mr. Wonderful" and unreleased songs, for the US market.