Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_66234 ( "Year" real, "Stage" real, "Start" text, "Finish" text, "Leader at the summit" text )

### Question ###
What is the highest stage number for a year later than 1948, leader at the summit was group, and finish was Bagn res-De-Bigorre?

### Accurate SQL ###

SELECT MAX("Stage") FROM table_66234 WHERE "Year" > '1948' AND "Leader at the summit" = 'group' AND "Finish" = 'bagnères-de-bigorre'