close up tilt-up - concentric circles mark the layers of a tree in a cross-section of wood in a lab. / usa - 年輪 個影片檔及 b 捲影像00:17
demonstrating crossdating principle in laboratory of tree-ring research, narrow piece of tree trunk, pointer indicating annual growth rings,... - 年輪 個影片檔及 b 捲影像00:36
concentric circles mark the layers of a tree in a cross-section of wood in a lab. - 年輪 個影片檔及 b 捲影像00:23
1970s: dendrochronology charts being compared. aerial view of excavation site. archeologists going into hole, examining artifact - 年輪 個影片檔及 b 捲影像00:36
concentric circles mark the layers of a tree in a cross-section of wood in a lab. - 年輪 個影片檔及 b 捲影像00:17
1950s ms forest ranger showing redwood tree cross-section to woman in yosemite national park - 年輪 個影片檔及 b 捲影像00:05加州
woman using tablet with stock market chart and stylus, analyzing investment data for smart financial decisions. - 年輪 個影片檔及 b 捲影像00:08
ws aerial zi shot of springwood home surrounded by tree / new york, united states - 年輪 個影片檔及 b 捲影像01:11
leafcutting bee (megachile remotissima cockerell) covered in pollen heading to brood chamber - 年輪 個影片檔及 b 捲影像00:04
a hand uses a sharp tool to point out patterns in a cross-section of wood in a lab. - 年輪 個影片檔及 b 捲影像00:33
concentric circles mark the layers of a tree in a cross-section of wood in a lab. - 年輪 個影片檔及 b 捲影像00:21
cross section of a tree trunk with annual rings, rhineland-palatinate, germany, europe - 年輪 個影片檔及 b 捲影像00:24
governor-elect franklin d. roosevelt speaks from the veranda of his home "springwood"; he casually leans one arm on the balcony railing as he speaks,... - 年輪 個影片檔及 b 捲影像00:59
"america" superimposed over us pres. franklin roosevelt standing for photo opportunity on night of his reelection with group of people on porch of... - 年輪 個影片檔及 b 捲影像01:48自由女神像 - 自由島
