http://nla.gov.au/nla.obj-268087252
Pennsylvania. Bureau of Topographic and Geologic Survey & Williams and Heintz Map Corporation. (1973). Topographic map of Lehigh County, Pennsylvania Retrieved September 1, 2024, from http://nla.gov.au/nla.obj-268087252
Pennsylvania. Bureau of Topographic and Geologic Survey and Williams and Heintz Map Corporation. Topographic map of Lehigh County, Pennsylvania [Harrisburg, Pa.]: [Pennsylvania Bureau of Topographic and Geologic Survey], 1973. Web. 1 September 2024 <http://nla.gov.au/nla.obj-268087252>
Pennsylvania. Bureau of Topographic and Geologic Survey & Williams and Heintz Map Corporation. 1973, Topographic map of Lehigh County, Pennsylvania [Pennsylvania Bureau of Topographic and Geologic Survey], [Harrisburg, Pa.] viewed 1 September 2024 http://nla.gov.au/nla.obj-268087252
{{Citation
| author1=Pennsylvania. Bureau of Topographic and Geologic Survey.
| author2=Williams and Heintz Map Corporation.
| title=Topographic map of Lehigh County, Pennsylvania
| year=1973
| scale=Scale 1:50,000
| section=1 map : color ; 84 x 95 cm
| location=[Harrisburg, Pa.]
| publisher=[Pennsylvania Bureau of Topographic and Geologic Survey]
| url=http://nla.gov.au/nla.obj-268087252
| id=nla.obj-268087252
| access-date=1 September 2024
| via=Trove
}}
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