Patents and contemporary press are the main primary sources for this section.
Water & Forestry
The strongest primary evidence for early work comes from patent PDFs (log‑flume systems, timber transport, water conduits) and contemporary press issues archived by ANNO. PKS narrative claims are preserved but clearly labeled where they are not yet corroborated by independent documents.
Primary Patent Evidence
These patent scans document log‑flume construction, timber transport, watercourse regulation, and water‑flow guidance. They are primary technical sources but still require patent‑office cross‑checks for legal dates.
Source IDs
pat-113-487, pat-113-526, pat-113-772-usa, pat-113-848, pat-114-660, pat-118-713, pat-122-144, pat-125-819, pat-136-214, pat-138-296
Contemporary Press (ANNO)
ANNO full‑issue PDFs provide period reporting that can corroborate projects and public reception. These are primary sources but require article‑level extraction.
Source IDs
anno-waw-1929-01-33, anno-waw-1931-nr05, anno-waw-1931-nr10, anno-waw-1933-nr10, anno-alb-1932-12-24
Archive narrative retained for context.
PKS describes specific forestry roles and installations. These claims are preserved as archive narrative until matched to independent documents.
Derived Research Aids
OCR summaries exist for patent first pages; they are useful for navigation but not authoritative. See `research/02-patents.md` for the current OCR summary table.