识别R中指定距离内的点

From a list of 10,000 stations with decimal coordinates, I am trying to identify stations which are within 100 feet of each other based on the distance calculated between these stations and create a subset of these stations. In the final list I want to have the names of the stations which are within 100 feet of each other, their latitude and longitudes and the distance between them. From a list of 10,000 stations with decimal coo