Microdensitometer for tree ring analysis, by Joyce-Loebl Limited, 1978
1978
Microdensitometer used to measure the X-ray density of tree rings in research into past climates, 1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978
1978