When was Labov's most influential study published?

Im which English language is the letter "r" pronounced full?

Labov opposed who's opinion on the pronounciation of "r"?

Saks Fifth Avenue was a shopping mall that catered to whom?

Who was Klein's store aimed at?

How many stores did Labov choose for research and what are they?

Labov asked people what floor?

Labov spend on 6,5 hours for survey

An extension of LWC?

Labov's second major study consist of how many types of activities?