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Novissima et Accuratissima Totius Americæ Descriptio per Gerardum a Schagen.
This map of both North America and South America shows California as an island. The map was popular, and was probably first attributed to Claes Visscher of Amsterdam in the 1670s.
The largest version is a six megabyte file. You can also download the photograph I used as a starting-point from the Library of Congress. I have cleaned this image up rather aggressively.