Abstract: A bookmarker comprises a thin, planar base member. A thin, planar upper member has the shape of the base member with the perimeter edges of the upper member being permanently adhered to corresponding perimeter edges of the base member. At least two elongate linear slots are formed in the upper member. The slots are parallel with each other and spaced apart. A window opening is provided for each slot. Each window opening is located closely adjacent to a respective slot and between opposite ends of such slot. An elongate, thin slide member is provided for each slot. Each slide member is positioned between the base member and the upper member for sliding motion back and forth along a respective slot. The slide member has a width that spans the respective slot and the respective window opening for that slot. An elongate, raised rib projects from a surface of each slide member so that the rib is received in a respective slot for longitudinal sliding motion back and forth along such slot.