What is a historical source?

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Historical sources include documents, artifacts, archaeological sites, features. oral transmissions, stone inscriptions, paintings, recorded sounds, images and oral history. Even ancient relics and ruins, broadly speaking, are historical sources.

idk if thats what u wanted  

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.