⁣An "audiochapter" from my book Hoffman Lenses — which can be found as a free blog at:

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You can also purchase a paperback version of the aforementioned pulp, here:

https://www.amazon.com/Hoffman-Lenses-Hugh-Mungus/dp/1727631250/ref=sr_1_19?dchild=1&keywords=hugh mungus&qid=1615354594&s=books&sr=1-19

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