[Psammographic findings in various clay materials].
D000538:Aluminum Silicates; D000077215:Clay; D006801:Humans; D012822:Silicon Dioxide / Q000032:analysis*
D000538:Aluminum Silicates; D012822:Silicon Dioxide; D000077215:Clay
SILICA/determination
Esami psammografici di alcuni materiali argillosi.