GreenEarth Publishing Inc. - Publisher of Secrets to a Successful Greenhouse and Business. Also contains links, hydroponic information, greenhouse improvement tips, and more.
MWPS (MidWest Plan Service) - Develops agricultural publications covering topics including: agricultural engineering; farm business management; animal sciences; soil, air, and water management; manure management; and ventilation for livestock housing.
Thomson Publications - Publishes books dealing with agricultural chemicals, farm safety, pest control and turf and ornamental issues.
