The color of this is a dark teal or green - it looks blue in the photo.
American Presbyterian Congo Mission. Constitution and By-Laws of the American Presbyterian Congo Mission. Luebo, Congo Belge, Africa: The J. Leighton Wilson Press | American Presbyterian Congo Mission, 1922. First Edition. 
Dark green pebble cloth, 5 x 7 inches, a few blotchy stains to the binding, 58 pp., index, clean text. Very good. Hardcover.
No entries for any edition at WorldCat. We have seen three binding varieties for this issue: blue pebble cloth, dark green pebble cloth, and a mauve plain cloth.
There are 38 articles in the Constitution - these define the work, the officers & workers, the powers of the officers, the election of officers, &c. The By-Laws start with no. 39 and run to no. 113. These treat with standing committees and their duties, how appointed, then practical matters of budgets, ordering supplies, hospital and medical fees, &c. Ends with a 8 pp. index.