About: http://webisa.webdatacommons.org/444680488

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Dolomite, oyster shell, and bone meal are natural forms of calcium that may contain trace amonut of heavy metals such as lead so it would be wise to avoid these forms.
http://www.w3.org/ns/prov#wasQuotedFrom	acne.org