Vennie, I know Zep's stuff by heart, but not the names of the songs because I seldom play anything beyond the 2nd album (the end of their "heavy" period... #3 marked the arrival of the "acoustic" period). Some of them are obvious - Houses of the Holy has the song title in the lyrics, as do "In my Time of Dying" and a few others, and "This wasted land" could only be a reference to...
"Kashmir".