https://www.countyofnapa.org/DocumentCenter/View/7957/45-Biological-Resources-General-Plan-DEIR-PDF
https://www.google.com/books/edition/Johnson_Fain_Partners/ZrL47OUrWu4C?hl=en&gbpv=1&dq=%22iron+mine+creek%22+napa&pg=PA156&printsec=frontcover
https://www.waterboards.ca.gov/rwqcb2/water_issues/programs/planningtmdls/basinplan/web/fig/fig_2-08.pdf
http://johnsonfain.com/projects/architecture/residential/st-helena-residence/
https://books.google.com/books?id=v3LOAAAAMAAJ&pg=RA2-PA327&lpg=RA2-PA327&dq=napa+county+%22iron+mine%22&source=bl&ots=kLzO_aiO8k&sig=ACfU3U0jN2sYhbapUBvNpvSzL5gtseMpjg&hl=en&sa=X&ved=2ahUKEwizirOb84H1AhV2GjQIHZGMDkQ4WhDoAXoECCAQAw#v=onepage&q=napa%20county%20%22iron%20mine%22&f=false
https://www.wsj.com/articles/SB1001645392694603120
https://www.sfgate.com/magazine/article/SQUARE-ROOMS-3099310.php