舊主線 (巴爾的摩與俄亥俄鐵路) (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "舊主線 (巴爾的摩與俄亥俄鐵路)" in Chinese language version.

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low place

low place

2web.archive.org

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archive.org (Global: 6^th place; Chinese: 4^th place)

Harwood, Jr., Herbert H. Impossible Challenge: The Baltimore & Ohio Railroad in Maryland. Baltimore, MD: Barnard, Roberts. 1979. ISBN 0-934118-17-5.

trainweb.org (Global: low place; Chinese: low place)

Okonski, Steve. B&O Old Main Line Photo Tour – Mt. Airy Loop – East. B&O RR Photo Tours. [2009-11-06]. （原始内容存档于2020-01-24）.
Old Main Line Photo Tour. www.trainweb.org. [2022-01-19]. （原始内容存档于2022-01-19）.

web.archive.org (Global: 1^st place; Chinese: 1^st place)

Okonski, Steve. B&O Old Main Line Photo Tour – Mt. Airy Loop – East. B&O RR Photo Tours. [2009-11-06]. （原始内容存档于2020-01-24）.
Old Main Line Photo Tour. www.trainweb.org. [2022-01-19]. （原始内容存档于2022-01-19）.