Origin of the Dragon Sacrifice?

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Does anyone know who was the first player to use the ...Rxc3 exchange sacrifice in the Dragon Defense? I found one example from 1968-69 that I documented here -- Opening Exchange Sac [B7x] -- but it's clear from the notes to that game that the idea was already well known at the time. Wading through historical games is like looking for a needle in a haystack and I'm hoping a member of has better references than I do. Anybody?