scraping website

library(rvest)
url <- "http://rtais.wto.org/UI/PublicMaintainRTAHome.aspx"
s <- html_session(url) %>% follow_link(css = "#ContentPlaceHolder1_lnkRTAList")

I would to loop over pages to get a dataframe with 2 columns:
first column represent page number of the website
second column represents rta links such as http://rtais.wto.org/UI/PublicShowRTAIDCard.aspx?rtaid=640
Please advise.
Thanks

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