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San Pablo Huitzo, Oaxaca, Mexico, Porfirio Morales places a growing medium for oyster mushrooms on
BRK24C26_085

San Pablo Huitzo, Oaxaca, Mexico, Porfirio Morales...

Close up of exfoliated vermiculite, a hydrous mineral used as soilless growing medium for plants
BRK22D91_352

Close up of exfoliated vermiculite, a hydrous mine...