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Rochester Optics

 * IDEX Health and Science Optical Filters
 * Dichroic filters
 * Optical filter


 * Sydor Optics
 * Optical Glass

Misc
https://ntp.niehs.nih.gov/ntp/roc/content/profiles/chromiumhexavalentcompounds.pdf

The chromium(VI) compounds most commonly encountered in industry are calcium chromate, chromium trioxide, sodium chromate and dichromate, potassium chromate and dichromate, lead chromate, strontium chromate, and zinc chromate (IARC 1990, Costa 1997). However, this listing applies to all hexavalent chromium compounds, not just to those specified above.

Delta

Barge Canal Bulletin Volumes 1-2 By New York (State). State Engineer and Surveyor · 1908

https://www.google.com/books/edition/Barge_Canal_Bulletin/IjgYAQAAIAAJ?hl=en&gbpv=1&bsq=Delta

https://www.google.com/books/edition/Barge_Canal_Bulletin/IjgYAQAAIAAJ?hl=en&lpg=PA302

https://books.google.com/books?id=IjgYAQAAIAAJ&pg=RA2-PA393

Vol2 pp393-5

$995,347

The project included the removal of 295 buildings including 70 dwelling and 2 cemeteries and other private burial lots to be exhumed and reburied.