《The Elements of Practical Astronomy》

1929《The Elements of Practical Astronomy》由于是年代较久的资料都绝版了,几乎不可能购买到实物。如果大家为了学习确实需要,可向博主求助其电子版PDF文件(由W. W. Campbell 1929 The Macmillan Company 出版的版本) 。对合法合规的求助,我会当即受理并将下载地址发送给你。

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THE ELEMENTS OF PRACTICAL ASTRONOMY(1926 PDF版)
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