1
The Milky Way Galaxy [E-Book] : Proceedings of the 106th Symposium of the International Astronomical Union Held in Groningen, The Netherlands 30 May – 3 June, 1983 /
Other Personal Name(s): “...Woerden, Hugo Van...”

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Birth and Evolution of Massive Stars and Stellar Groups [E-Book] : Proceedings of a Symposium held in Dwingeloo, The Netherlands, 24–26 September 1984 /
Other Personal Name(s): “...Woerden, Hugo van...”

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3
Oort and the Universe [E-Book] : A Sketch of Oort’s Research and Person /
Other Personal Name(s): “...Woerden, Hugo van...”

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4
Topics in Interstellar Matter [E-Book] : Invited Reviews Given for Commission 34 (Interstellar Matter) of the International Astronomical Union, at the Sixteenth General Assembly of IAU, Grenoble, August 1976 /
Other Personal Name(s): “...Woerden, Hugo Van...”

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