"Charles Collins: The Sioux City Promotion of the Black Hills"https://www.sdhspress.com/journal/south-dakota-history-2-2/charles-collins-the-sioux-city-promotion-of-the-black-hillshttps://www.sdhspress.com/@@site-logo/sdshp-logo.jpg
"Charles Collins: The Sioux City Promotion of the Black Hills"