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	1.	Researches relative to the planet Neptune. By Sears C. Walker. by Walker, Sears Cook, 1805-1853 Series: Smithsonian contributions to knowledge [vol. II, art. 1] \| Smithsonian Institution publication 3 Material type: Text; Format: print ; Literary form: Not fiction Publication details: [Washington, Smithsonian Institution, 1849] Availability: No items available. Add to cart (remove)
	2.	An ephemeris of the planet Neptune ... [1846]-1852. By Sears C. Walker, esq. by Walker, Sears Cook, 1805-1853 Series: Smithsonian contributions to knowledge: vol. II, app. I-III; vol. III, app. I \| Smithsonian Institution publication 5-7, 24 Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, D.C., Gideon and Co., printers [1849-53] Availability: No items available. Add to cart (remove)

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