Sources Citing Lenin's Use of Vanguard Party Terminology

Where does Lenin specifically use the term “vanguard party”? Hi comrades, I’m currently compiling sources for an article on the concept of the vanguard and/or vanguard party within Marxism. I’ve already read a lot of Lenin, so I know “vanguard party” isn’t a term that actually appears in his most frequently read works. He usually just says “vanguard” and it’s up to interpretation whether or not he’s talking about the party specifically, or the most organized and conscious segments of capitalist society as a whole. I did a term search for “vanguard party” in all Lenin’s works on the Marxists Internet Archive and was genuinely surprised when “The Crisis in Menshevism” was the only result I got. I know that the search feature on the Marxists Internet Archive can be pretty faulty though, as I’ve seen it fail to locate many documents which are in fact on the website, so I was wondering if anyone here was aware of any other works where Lenin uses the term “vanguard party”? I’m also open to the possibility that different translations may exist for certain works where the same Russian term may be alternately translated as “vanguard” or “vanguard party.” Anyway, don’t jump down this rabbit hole looking for answers for me unless you’re also fascinated by these questions. I’m just hoping to find some people who already have the answers here. Thanks in advance and solidarity.