 | Malt industry North Dakota. | (1) |
| Mammals Alabama. | (1) |
| Man Influence of environment. | (1) |
| Man Influence on nature. | (2) |
| Manure handling. | (1) |
| Maple Diseases and pests. | (1) |
| Marine resources New England. | (1) |
| Marketing (Home economics) | (3) |
| Marketing (Home economics) Southern States. | (1) |
| Marketing (Home economics) Study and teaching. | (1) |
| Marketing of livestock Poland Statistics. | (1) |
| Marketing of livestock West Virginia. | (1) |
| Markets Ohio Cincinnati. | (1) |
| Markets Ohio Dayton. | (1) |
| Market surveys Japan. | (1) |
| Market surveys United States. | (1) |
| Marsh flora. | (1) |
| Materials handling. | (1) |
| Meat. | (2) |
| Meat cutting. | (1) |
| Meat, Frozen. | (1) |
| Meat industry and trade. | (2) |
| Meat industry and trade Argentina. | (1) |
| Meat industry and trade Australia. | (1) |
| Meat industry and trade Bibliography. | (1) |
| Meat industry and trade Denmark. | (1) |
| Meat industry and trade European Economic Community countries. | (1) |
| Meat industry and trade New Zealand. | (1) |
| Meat industry and trade United States. | (8) |
| Meat industry and trade United States Mathematical models. | (2) |
| Meat industry and trade United States Statistics. | (1) |
| Meat industry and trade West Virginia. | (1) |
| Meat inspection. | (1) |
| Meat inspection United States. | (1) |
| Meat Labeling. | (1) |
| Meat Packaging. | (1) |
| Meat Prices United States. | (1) |
| Meat substitutes Marketing. | (1) |
| Medical personnel Louisiana. | (1) |
| Medicinal plants Appalachian Region. | (1) |
| Meloidae Arizona. | (1) |
| Mental health services Montana. | (1) |
| Mental illness Montana. | (1) |
| Mentally ill Rehabilitation Montana. | (1) |
| Menus. | (1) |
| Merchant ships United States. | (1) |
| Meristem culture. | (1) |
| Mesquite. | (2) |
| Mesquite Control. | (1) |
| Meteorology, Agricultural Michigan. | (1) |
| Meteorology, Agricultural North Dakota Tables. | (1) |
| Meteorology Alaska Observations. | (1) |
| Meteorology Middle West Observations. | (1) |
| Meteorology Observations. | (1) |
| Meteorology Ohio Observations. | (1) |
| Methoxychlor. | (1) |
| Mexican Americans. | (1) |
| Mexican Americans Employment Texas Atascosa County. | (1) |
| Mexican Americans Employment Texas San Antonio. | (1) |
| Migrant labor Southwestern States. | (1) |
| Migration, Internal Connecticut. | (1) |
| Migration, Internal United States. | (1) |
| Milk Analysis. | (1) |
| Milk as food. | (1) |
| Milk Consumption Israel. | (1) |
| Milk, Dried. | (2) |
| Milk Grading and standardization. | (1) |
| Milk hygiene United States. | (1) |
| Milking. | (1) |
| Milk Prices United States. | (4) |
| Milk production United States. | (1) |
| Milk production United States Statistics. | (1) |
| Milk proteins. | (1) |
| Milk Statistics. | (1) |
| Milk supply Northeastern States Mathematical models. | (1) |
| Milk supply Southern States. | (1) |
| Milk trade. | (1) |
| Milk trade Middle West. | (1) |
| Milk trade Northeastern States Mathematical models. | (1) |
| Milk trade Southern States. | (1) |
| Milk trade United States. | (4) |
| Milk trade United States Statistics. | (2) |
| Milk Transportation Costs. | (1) |
| Milk United States Marketing Statistics. | (1) |
| Milk United States Transportation Rates. | (1) |
| Mines and mineral resources Hawaii. | (1) |
| Mines and mineral resources Illinois Congresses. | (1) |
| Minks Diseases. | (1) |
| Minks Parasites. | (1) |
| Mistletoe. | (1) |
| Mixing machinery. | (1) |
| Mohair Statistics. | (1) |
| Molds (Botany) Control. | (1) |
| Moments of inertia. | (1) |
| Moose Michigan Isle Royale National Park. | (1) |
| Moose Michigan Isle Royale National Park Ecology. | (1) |
| Mortality Connecticut. | (1) |
| Mortgage loans United States. | (1) |
| Mortgage loans United States Statistics. | (1) |
| Mosquitoes. | (2) |
| Mosquitoes Control United States. | (1) |
| Mosquitoes Iowa. | (1) |
| Mosquitoes Northwestern States. | (1) |
| Moths Maine. | (1) |
| Motor trucks in freight service, Refrigerated. | (1) |
| Mountain climate. | (1) |
| Mountain pine beetle. | (1) |
| Mountain roads. | (1) |
| Mourning dove. | (2) |
| Mouth. | (1) |
| Mulching. | (1) |
| Mule deer. | (1) |
| Multiple cropping. | (1) |
| Multiple cropping Developing countries. | (1) |
| Multiplier (Economics) | (1) |
| Multivariate analysis Data processing. | (1) |
| Muskmelon Breeding. | (1) |
| Muskmelon Texas Breeding. | (1) |
| Mustard. | (1) |
| Mutillidae Bibliography. | (1) |
| Mycorrhiza Congresses. | (1) |
| Mycotoxins. | (1) |