Paper can be purchased as loose, single sheets or in sketchbooks and pads. Single sheets enable you to try out several different papers and can be cut or torn to size. When drawing buildings on location, however, you will find using a sketchbook invaluable. They are made with paper of various surfaces, colors, and weights, and come in many sizes and bindings in both portrait and landscape formats. Pocket-sized books can be carried anywhere, but may be restrictive when you’re tackling larger subjects. Big sketchbooks are tiring to hold, but offer adaptable space, with the option of making several studies on one page.