Bulk download ANU Press

$url1 = "https://press.anu.edu.au/publications?sort=score&p="
$url2 = 'https://press.anu.edu.au'

for($i=0; $i -lt 102;$i++){

$page = Invoke-WebRequest -Uri $url1+$i

$links = @()
$links += $page.Links | Where-Object outerHTML -Like "*Download for free*" | Select-Object href

foreach ($pdf in $links)
{
$url3 = $url2+$pdf.href
    $dload_page = Invoke-WebRequest -Uri $url3
    $dlink = ($dload_page.Links | Where-Object outerHTML -Like "*.pdf*" | Where-Object innerHTML -Like PDF*).href
    $title = $dload_page.ParsedHtml.nameProp
    $filename = $title+".pdf"
    Invoke-WebRequest -Uri $dlink -OutFile "$filename"
}
}