This is an internal function and is not intended for users. See instead call_census_api.
call_api_once(variables_to_get, geoid, allgeos, data_source, year, period,
api_key)A character vector of the desired variable names for the Census API call, defined at https://www.census.gov/data/developers/data-sets.html
A character string with a FIPS code, between 2 and 15 digits long.
(optional) A string identifying the type of geography for
which to collect data within the the requested geoids. Must be one
of c('co', 'tr', 'bg', 'bl'). For instance, if allgeos =
"bg", will return all block groups within the given geoids.
A string identifying whether the SF1 (decennial census) or ACS data is desired.
If data_source = "acs", the final year of the summary
period. Default is 2013.
If data_source = "acs", the length of aggregation period.
Default is 5, or a 5-year aggregation table.
The user's Census API key (as a character string). You can get
a free key from [Census](http://api.census.gov/data/key_signup.html). See
vignette('censusr', package = 'censusr') to setup a default key as
an environment variable.
A codedata.frame with the requested variables at the requested geography.