Isoetes - grass-like fern that grows on bottom of Lake Youngs and surfaces each fall - prints and negs - LHB - 10-26-1954 - 03967-03972, 1954 - 1954, Box: 2, Folder: 03967. Water Department Photographic Negatives, 8200-13. Seattle Municipal Archives. https://leglas100/finding-aids/repositories/2/archival_objects/194411 Accessed June 02, 2026.