secondary literature
secondary work
primary work
root
tertiary work
secondhand
intersource
bye
at first hand
firsthand
thirdhand
third hand
fons et origo
ur-source
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native soil
exogenesis
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sourcework
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multisource
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derive
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double up
authorship
metapurpose
secondariness
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straight from the horse's mouth
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provenance
long way around
deutero-
polygenetic
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