Staple bound booklets dating from the middle of the 20th century, published by the National Council of Churches of Christ in the USA. These were apparently first owned by a Sunday School group, from the owner's name on the wraps or inside. Some toning to the pages, creased wraps and so forth. The press was launched in 1935, and suspended publication in 1998, reopening several years ago.

These remind me of the supplemental reading pamphlets we had in elementary school, but are aimed at young adults rather than youngsters.