1Peter S. Du Ponceau to Thomas Jefferson, 9 October 1820 (Jefferson Papers)
I take the liberty of introducing to you in the person of M r L. C. Vanuxem , the bearer hereof,...
2Peter S. Du Ponceau to Thomas Jefferson, 23 March 1821 (Jefferson Papers)
I had the honor some time ago of introducing to you M r L. C. Vanuxem , a young American...