Download free high-res copies of my two text books and the new posters. Any donations using this link help the work of campbell teaching. https://drjohncampbell.co.uk/ Massachusetts will give you a $75 gift card if you get vaccinated or boosted https://www.msn.com/en-us/news/us/massachusetts-will-give-you-a-2475-gift-card-if-you-get-vaccinated-or-boosted/ar-AA14H0pA…
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