Collection place
- Mackenzie River, Northwest Territories, Canada1 objects
- Mad River, Humboldt County, California1 objects
- Madera County, California6 objects
- Madhav Bagh (Hindu temple), Mumbai, Maharashtra State1 objects
- Maharashtra State, India5 objects
- Malay Peninsula, Southeast Asia4 objects
- Mariposa County, California6 objects
- Massachusetts1 objects
- Mayer, Yavapai County, Arizona1 objects
- McCloud River, Shasta County, California1 objects
- McKinley County, New Mexico1 objects
- Mendocino County, California3 objects
- Mexico9 objects
- Micronesia4 objects
- Middle East3 objects
- Mindoro Island, Luzon island group, Philippines1 objects
- Modoc County, California10 objects
- Mojave Desert, Southeastern California1 objects
- Moose Factory, Ontario, Canada1 objects
- Mumbai (Bombay), Maharashtra State, India5 objects