...Sanitation 12mo, 1 50 Richards's Conservation by Sanitation 8vo, 2 50 Cost of Cleanness 12mo, 1 00 Cost of Food. A Study in Dietaries 12mo, 1 00 Cost...12mo, 1 00 * Richards and Williams's Dietary Computer »vo, 1 50 Richards and Woodman's Air, Water, and Food from a Sanitary Standpoint 8vo, 2 00 * Richey's...