TREE IS BORN, A
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✎ Suggest a correctionShows the techniques Forest Service researchers employ to produce hybrid pines though controlled pollination and through the selection of superior trees and use of their natural seed. Shows a pine cone opening and tree seeds germinating and growing.
Sources
- usgov-av-1974 — title, year, creator, length, color, sound, description
Record added 2026-07-01 03:46:11 · Suggest a correction