Web Scrapping with beautifulSoup and unchanging URL : I am trying to Web Scrap

'''

url='https://classicalnumismaticgallery.com/advancesearch.aspx?auctioncode=0&pricerange=0&keyword=Indore&category=&material=0&lotno=&endlotno'
    
    r = requests.get(url) 
    soup = BeautifulSoup(r.text , 'lxml')
    details = soup.find_all('span', {'class' : 'src'})
    i=0
    for d in details:
    	det = d.text
    	det = det + d.string
    	print(det)

'''
but it scraps only one webpage. I inspected the `XHR` but nothing gets triggered when we change the page.

I also inspected the `FORM DATA` in advancesearch.aspx but it also doesn't have page Index related information. 
On page click event I found `ctl00$ContentPlaceHolder1$gvItem$ctl01$ctl03` but not sure how to use this in 'URL'.

What URL should I use to access the other pages?

