I'm writing 2 human osteology essays. Most of my references are from 2000/1990 but I have some from 1920 etc. Is this to old? My problem is that these are the papers where the methods were first developed/described! Can I still cite them? I know our unit is archaeology based so most papers are from 1990 etc but is 1920/1960/1940 too old? Thank you!
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