Warning: A non-numeric value encountered in /homepages/7/d436128893/htdocs/wp-content/plugins/elementor/includes/libraries/bfi-thumb/bfi-thumb.php on line 748 Warning: A non-numeric value encountered in /homepages/7/d436128893/htdocs/wp-content/plugins/elementor/includes/libraries/bfi-thumb/bfi-thumb.php on line 751 Study of a Head – Letter to Michael Nelson Ink and black chalk on paper 47.5 x 38.7 cm (18.7 in. x 15.2 in.) Signed and annotated. C. 1940