Pre-1986.....?

To restate the question: Two of Motown's LP releases had a chart life span of more than sixty weeks [[a year and a couple of months!) on the Top Forty rungs of Billboard's weekly Top LPs chart.

--According to The Book Of Top 40 Albums by Joel Whitburn released 1986.--

This is just a guessing challenge , so if you have that book , no cheating , please!!


One album is more apparent , the other , not so much!

Any guesses??