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Subject
- bok globules2
- co line emission1
- galaxy classification systems2
- h ii regions4
- infrared astronomy1
- infrared photometry7
- infrared sources1
- interstellar clouds[remove]14
- interstellar medium5
- millimeter astronomy2
- molecular clouds1
- nebulae1
- open star clusters1
- optical astronomy2
- photometry7
- pre-main sequence stars3
- proper motions1
- radio astronomy2
- radio spectroscopy1
- spectroscopy1
