FIG. 1 is a top, front, right perspective view of a first embodiment of a door ladder and shelf combination showing our new design;
FIG. 2 is a front elevation view of the door ladder and shelf combination of FIG. 1;
FIG. 3 is a left elevation view of the door ladder and shelf combination of FIG. 1;
FIG. 4 is a right elevation view of the door ladder and shelf combination of FIG. 1;
FIG. 5 is a top plan view of the door ladder and shelf combination of FIG. 1;
FIG. 6 is a bottom elevation view of the door ladder and shelf combination of FIG. 1;
FIG. 7 is a top, front, right perspective view of a second embodiment of a door ladder and shelf combination showing our new design, where a non-transparent material, as indicated by the dot surface shading pattern, is different from a remainder of the door ladder and shelf combination;
FIG. 8 is a front elevation view of the door ladder and shelf combination of FIG. 7;
FIG. 9 is a scaled up front elevation view of the door ladder and shelf combination of FIG. 7 as indicated in FIG. 8;
FIG. 10 is a left elevation view of the door ladder and shelf combination of FIG. 7;
FIG. 11 is a right elevation view of the door ladder and shelf combination of FIG. 7;
FIG. 12 is a top plan view of the door ladder and shelf combination of FIG. 7;
FIG. 13 is a bottom elevation view of the door ladder and shelf combination of FIG. 7;
FIG. 14 is a top, front, right perspective view of a third embodiment of a door ladder and shelf combination showing our new design, where two different non-transparent materials, as indicated by the legend, are used;
FIG. 15 is a front elevation view of the door ladder and shelf combination of FIG. 14;
FIG. 16 is a scaled up front elevation view of the door ladder and shelf combination of FIG. 14 as indicated in FIG. 15;
FIG. 17 is a left elevation view of the door ladder and shelf combination of FIG. 14;
FIG. 18 is a right elevation view of the door ladder and shelf combination of FIG. 14;
FIG. 19 is a top plan view of the door ladder and shelf combination of FIG. 14;
FIG. 20 is a bottom elevation view of the door ladder and shelf combination of FIG. 14;
FIG. 21 is a top, front, right perspective view of a fourth embodiment of a door ladder and shelf combination showing our new design, where a metallic material, as indicated by the pattern in the legend, is different from a remainder of the door ladder and shelf combination;
FIG. 22 is a front elevation view of the door ladder and shelf combination of FIG. 21;
FIG. 23 is a scaled up front elevation view of the door ladder and shelf combination of FIG. 21 as indicated in FIG. 22;
FIG. 24 is a left elevation view of the door ladder and shelf combination of FIG. 21;
FIG. 25 is a right elevation view of the door ladder and shelf combination of FIG. 21;
FIG. 26 is a top plan view of the door ladder and shelf combination of FIG. 21;
FIG. 27 is a bottom elevation view of the door ladder and shelf combination of FIG. 21;
FIG. 28 is a top, front, right perspective view of a fifth embodiment of a door ladder and shelf combination showing our new design, where a metallic material and a white material, as indicated by the pattern in the legend, are used;
FIG. 29 is a front elevation view of the door ladder and shelf combination of FIG. 28;
FIG. 30 is a scaled up front elevation view of the door ladder and shelf combination of FIG. 28 as indicated in FIG. 29;
FIG. 31 is a left elevation view of the door ladder and shelf combination of FIG. 28;
FIG. 32 is a right elevation view of the door ladder and shelf combination of FIG. 28;
FIG. 33 is a top plan view of the door ladder and shelf combination of FIG. 28;
FIG. 34 is a bottom elevation view of the door ladder and shelf combination of FIG. 28;
FIG. 35 is a top, front, right perspective view of a sixth embodiment of a door ladder and shelf combination showing our new design, where two different non-transparent materials and a transparent material, as indicated by the legend, are used;
FIG. 36 is a front elevation view of the door ladder and shelf combination of FIG. 35;
FIG. 37 is a scaled up front elevation view of the door ladder and shelf combination of FIG. 35 as indicated in FIG. 36;
FIG. 38 is a left elevation view of the door ladder and shelf combination of FIG. 35;
FIG. 39 is a right elevation view of the door ladder and shelf combination of FIG. 35;
FIG. 40 is a top plan view of the door ladder and shelf combination of FIG. 35; and,
FIG. 41 is a bottom elevation view of the door ladder and shelf combination of FIG. 35.
The dashed broken lines shown in FIGS. 1-41 are included for the purpose of illustrating portions of the door ladder and shelf combination that form no part of the claimed design. In FIGS. 8, 9, 15, 16, 22, 23, 29, 30, 36 and 37, the dashed broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design. The dot-dash broken lines represent the boundary of the claimed design and form no part of the claimed design. The legends included in FIGS. 14, 21, 28, and 35 that indicate the type of surface shading used to indicate the different materials included in the respective embodiment form no part of the claimed design. The back of the door ladder and shelf combination is flat and unornamented for all of the provided embodiments.