RでデータをOECD加盟国に絞りたい時

後々の自分のために。OECD36カ国(2018年7月現在)です。
ISO 3166-1 alpha-3(iso3c)で国名が与えられている場合、

c("AUS","AUT","BEL","CAN","CHL","CZE","DNK","EST","FIN","FRA","DEU","GRC","HUN","ISL","IRL","ISR","ITA","JPN","KOR","LVA","LTU","LUX","MEX","NLD","NZL","NOR","POL","PRT","SVK","SVN","ESP","SWE","CHE","TUR","GBR","USA")

これが役に立てば...
http://www.oecd.org/about/membersandpartners/list-oecd-member-countries.htm
を参照しました。