My parents were involved in the cooperative movement. In the 1940's we went to "Coop Camp," Circle Pines Center, in Kalamazoo, Michigan. One of the activities at this family camp was group singing. They used the little book, "Sing It Again" from the Coop Recreation Service. Years later my parents bought a car, and when we traveled, we sang the songs in "Sing It Again" to pass the time away. When the book wore out, we sent away for a new copy.
When we moved to New York City, and bought a house in Queens, the previous owner had left behind "The Queens Song Book" from the Coop Recreation Service.
I continued to enjoy singing. When I was in college, my mother thrilled me with a gift of 10 or more books she ordered for me directly from the Coop Recreation Service.
In the 1970's I went to Pinewoods Camp in eastern Massachusetts for Folk Music Week run by the Country Song and Dance Society. In the bookstore was "Songs of All Time" from the Coop Recreation Service. Tony Salatan, the director of Folk Music Week, told me he had known Lynn and Katherine Rohrbough.