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Sphagnum in fruit, close up
Sphagnum on top of hummock
Spice container/shaker
Spider, before taking flight, Aeronautic spider, illustration from Henry Christopher McCook, "American Spiders and their Spinnin
Spider, burrow of psalistaps, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider carrying cocoon, Dolomedes sexpunctatus, illustration from Henry Christopher McCook, "American Spiders and their Spinning
Spider, cocoon, from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider, cocoon of Argiope cophinaria, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 188
Spider, Epeira triaranea tent, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider laying foundation lines, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider, Lycosid mother with young on her back, image from Henry Christopher McCook, "American Spiders and their Spinningwork," 1
Spider net with fly, Hyptiotes, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider, snare of triangle spider, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider, tetragnatha, navigating lake by silken sails, image from Henry Christopher McCook, "American Spiders and their Spinningw
Spider web, illustration from Henry Christopher McCook, "American Spiders and their Spinningwork," 1889
Spider with captured locust, insular spider, illustration from Henry Christopher McCook, "American Spiders and their Spinningwor
Spinacea oleracea (Chenopodiaceae)
Spinacia oleracea (Chenopodiaceae)
Spinacia sp. (Chenopodiaceae)
Spink, Wesley W.
Spink, Wesley W.
Spink, Wesley W.
Spink, Wesley W.
Spink, Wesley W.
Spink, Wesley W.
Spink, Wesley W.
Spiraea vanhouttei
Spiranthes cernua
Spiranthes cernua (Coccineorchis cernua)
Spirodela and Wolffia
Spirogya
Spirogyra, fruiting
Spirogyra, vegetative cell
Spivak, Walter A.
Spizizen, John
Splendid view of Emperor's Island, three smaller islands, and the hills beyond.
Split ply woolen camel belt
Sponsor Pride!
Spooner Hall. Morris Campus
Spore trapping data. (Box 1, Folder 27)
Sporting event
Sports crowd
Sports World, Dinkytown, Minneapolis, Minnesota
Spotted Mushroom, close-up
Spread city
Spread of rust from Barberry;  selected states and years. (Box 1, Folder 28)
Spring at San Lorenzo near Tehuacan
Spring at San Lorenzo near Tehuacan
Spring at San Lorenzo near Tehuacan
Spring at San Lorenzo near Tehuacan