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Learn all about astronomical measurements! https://t.co/tjsz6nwLOV
Learn all about astronomical measurements! https://t.co/tjsz6nwLOV
RT @e_astronomer: @goldipipschmidt book still good value https://t.co/yGGYeaCJAc but mine is free if your univ. has Springer subscn https:/…
@goldipipschmidt book still good value https://t.co/yGGYeaCJAc but mine is free if your univ. has Springer subscn https://t.co/WUpfFk9U3o
Got report from Springer. My book has 2300 chapter downloads http://t.co/w7swphjE2H is that good? no idea