Bibliography. Tom Brown's Field Guide to Nature Observation and Tracking, Tom Brown and Brandt Morgan, Berkeley, New York, 1983.. Other Sources of Information on Tracking and Nature Observation. A ...

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Differential diagnosis - Examine pictures of BCC, Bowen's disease, actinic keratosis and psoriasis Dr Nigel Stollery explains how to differentiate these similar-looking superficial skin lesions. Sign ...