IPUMS NHGIS tables in question:
NT20 (1970 Population of Places, by Race)
NT7 (1970 Population of Places, by Race)
NP6 (1970 Population of Places, by Race)
I’m aiming to build a time series of US Census Places by population, for which NHGIS offers data as far back as 1970. However, the 1970 and 1980 data do not have FIPS Place codes (2-digit state code + 5-digit Place code), rather they have something called Census Place Codes (2-digit state codes + 4-digit Place codes), for which there is not a lot of documentation online.
Where can I find a crosswalk that would allow me to identfy Places across these two systems?
Thank you in advance.