Perhaps you should try some spelling variations:
"natural teleology / early works to 1800" » "natural theology / early works to 1800", "natural topology / early works to 1800", "natural phonology / early works to 1800"
"natural geology / early works to 1800" » "natural theology / early works to 1800", "natural biology / early works to 1800", "natural mereology / early works to 1800"

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