Weather balloon data backs up missing decline found in old magazine

WUWT
"..The most mysterious period is from 1958 to 1978, when a steep 0.3C decline that was initially recorded in the Northern Hemisphere. Years later that was reduced so far it became a mild warming, against the detailed corroborating evidence from rabocore data.

Raobcore measurements are balloon measures. They started in 1958, twenty years before satellites. But when satellites began, the two different methods tie together very neatly–telling us that both of them are accurate, reliable tools.The decline in the original graph in National Geographic in 1976 is apparently backed up by highly accurate balloon data, and was based on peer reviewed data: Budyko 1969 and Angell and Korshover (1975). These two sets overlap from 1958 to 1960, and correlate well, so stitching them together is reasonable thing to do and it doesn’t make much difference which year is chosen from the overlap period (indeed any other choice makes the decline slightly steeper)."