the idea would be a district from a decade and what the population would currently be. Here's my guess (maybe mr phips can fill me in)
2000s map - NV 3
1990s map - likely AZ 3 or AZ 6
1980s map - CA 37
1970s map - NV AL
1960s map - NV AL
1950s map - CA 28
A footnote in 'Wesberry v Sanders' has the district population range for each state at the time of the decision. The largest was Dallas County (TX-9?) with just short of a million. Martin Frost's henchman bragged how the Democrats had avoided splitting the county in order to keep Republicans from being elected.
it was the 5th district, which at the time of Wesberry, actually was represented by a john bircher republican
The Democrats did not want to risk creating a 2nd Republican district. They punished the Democratic loser by making him run statewide at-large. Martin Frost's henchman bragged on that.
'Bush v Martin' was a companion case to 'Wesberry v Sanders'. It was decided by the SCOTUS 14 days after 'Wesberry v Sanders'. After redistricting under 'Bush v Martin' there were 3 Republican representatives, including the namesake in the case, who would later become President.