Subclass Q - Science (General).

Subclass QA - Mathematics.

Subclass QB - Astronomy.

Subclass QC - Physics.

Subclass QD - Chemistry.

Subclass QE - Geology.

Subclass QH - Natural History - Biology.

Subclass QK - Botany.

Subclass QL - Zoology.

Subclass QM - Human anatomy.

Subclass QP - Physiology.

Subclass QR - Microbiology.

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