"Me a co-OP," agreed Roger cheerfully, while the Ethels sat silently on the steps and thought about it.
"Ethel Morton at Chautauqua"
Mabell S. C. Smith
Quoted by McTaggart: OP.
"The Approach to Philosophy"
Ralph Barton Perry
But sad to say, the co-OP is on the side of the city; it is the city itself.
"Down-with-the-Cities"
Nakashima, Tadashi