"I thought the sky was green" --> "was" is in subjunctive mood, i.e. condition contrary …
thought与thoughts的区别thoughts是thought的名词复数，是指：思想、想法 …
be thought to be讲述事实,be thought of as后面是观点。be thought to be 的例句： 跟 …
Without having the whole context, I would propose: The referenced maps may be …
I googled the exact phrase "He thought on" in quotes and get back mostly quotes …
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