他们出版参考书。

They publish reference books.

《柯林斯英汉双解大词典》

1815年，他出版了第一张现代地质学地图——《英格兰、威尔士及部分苏格兰地区地层地图》，这张地质地图绘制得非常精确，直到现在仍有参考价值。

In 1815 he published the first modern geological map, "A Map of the Strata of England and Wales with a Part of Scotland", a map so meticulously researched that it can still be used today.

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这本参考书由美国文学家诺亚·韦伯斯特于1783年首次出版，在整个19世纪一直是美国的畅销书。

First published in 1783, this reference book by the American man of letters Noah Webster remained a bestseller in the U.S. throughout the 19th century.

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