I'm writing a graduate thesis on Oscar Lewis's "culture of poverty"
and I'm looking for information on the popularity of a particular book
from the period.

Specifically, I'm interested in the following:

(1) How many copies of Michael Harrington's The Other America were
sold between its publication in 1962 and 1970.

(2) When The Other America officially became a "best seller." (I
believe the answer is some time in 1964.)

Note: If it's difficult to discern how many copies were sold during a
particular period ('62-'70), I would still be interested in knowing
how many books have been sold to date.