Explore Chicago Collections
https://explore.chicagocollections.org/records/?f1-names=Tappan+Gregory&f2-types=Digital+Images&f3-types=Digital+Images&f4-topics=Natural+%26+Built+Environments%3A%3AConservation&f5-cities=Northfield&f6-institutions=Chicago+Academy+of+Sciences+%2F+Peggy+Notebaert+Nature+Museum