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A handbook on ventilation including air conditioning / by Percy L. Marks.

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Please note, due to essential maintenance work to our systems, you will be unable to request items in our collections; apply for, renew or pre-register for a library membership; or use our computers, laptops and printers from 06:00 on Saturday 12 July until 06:00 on Sunday 13 July. Our library will remain open as usual. Thank you for your understanding.

We're running paid user research studies to improve Wellcome Collection online

Percy Joseph Marks

Works from the collections

A handbook on ventilation including air conditioning / by Percy L. Marks.