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http://www.chemheritage.org/discover/collections/collection-items/scientific-instruments/rice-university-paperweight-commemorating-the-1996-nobel-prize-in-chemistry.aspx 0.7 2011-09-06 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/absorption-chamber-with-casing-removed-fixed-nitrogen-research-laboratory.aspx 0.7 2010-05-25 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/acetylene-welder-j.-j.-connor-at-fixed-nitrogen-research-laboratory.aspx 0.7 2010-07-07 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/aerial-photograph-of-u.s.-department-of-agriculture-278.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/aerial-photograph-of-u.s.-department-of-agriculture-279.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/aerial-view-of-lithium-brine-evaporation-panels-016-96-13-016.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/aerial-view-of-lithium-brine-evaporation-panels-017-96-13-017.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/white-canyon-plant-vanadium-corporation-of-america-utah-96-13-014.aspx 0.7 2010-07-03 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/william-a.-jackson-and-geiger-counter.aspx 0.7 2010-07-08 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/x-ray-studies-of-catalysts-for-nitrogen-fixation-fixed-nitrogen-research-laboratory.aspx 0.7 2010-07-12 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/urea-plant-fixed-nitrogen-research-laboratory.aspx 0.7 2010-07-09 weekly 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http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-at-fixed-nitrogen-research-laboratory-134.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-at-fixed-nitrogen-research-laboratory-135.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/analysis-and-indication-of-the-carbon-monoxide-content-of-a-gas-stream-fixed-nitrogen-research-laboratory.aspx 0.7 2011-05-19 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-366.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-368.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-at-arc-laboratory-fixed-nitrogen-research-laboratory.aspx 0.7 2010-07-07 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-at-fixed-nitrogen-research-laboratory-023.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/apparatus-at-fixed-nitrogen-research-laboratory-049.aspx 0.7 2010-07-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/air-conditioning-equipment.aspx 0.7 2010-07-07 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/alsike-clover-experiment-fixed-nitrogen-research-laboratory.aspx 0.7 2010-07-07 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/american-vanadium-company-mine-site-96-13-007.aspx 0.7 2010-06-21 weekly http://www.chemheritage.org/discover/collections/collection-items/photographs/ammonia-oxidation-apparatus-fixed-nitrogen-research-laboratory.aspx 0.7 2010-07-07 weekly 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