This pattern is from the book Blueprint Crochet which was available in print and eBook form. It was also available as a single pattern download from the Interweave Store.

Yarn: Light Worsted-weight (#3 Medium)
Shown: Oasis by South West Trading Company (100% soysilk; 240 yd 219.5 m/ 3.5 oz 100g): #57 Natural, 3,(3, 5, 5) hanks.
Hook: H/8 (5.0mm) and F/5 (3.75mm) or hooks needed to obtain gauge.
Notions: Tapestry needle; 2 (2, 3, 3) 1 ¼“ (32 mm) toggle buttons.
Gauge: 4½ x 4½” (11.5 x 11.5 cm) =Granny Motif with larger hook
4 x 4” (10.5 x 10.5 cm) = Granny Motif with smaller hook
Size: Small, (Medium, Large, X-Large) fits 32 (36, 40, 45)“ (81.5 91.5, 102, 114.5 cm)
bust circumference and 12 (13½, 16, 18)”, (30.5 34.5, 41, 46 cm) upper arm circumference.
Bolero shown in size Medium.