Free books first published in the 1620s: public-domain works dated 1620-1629 in the catalogue (Internet Archive scans and dated Gutenberg editions), most downloaded first, with download links. Period reading and historical research. $0.01 per page of 20.
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| Base | exact | $0.01 USDC | 0xFC24...eBB3 |
| Base Sepolia | exact | $0.001000 USDC | 0xFC24...eBB3 |