(summary of): Preface. I. General properties of fractals. II. Analysis of fractal properties of materials. III. Polymer statistics and self-avoiding-walks. IV. Branched polymers, gelation and percolation. V. (A) Irreversible growth models: Laplacian fractals, dielectric breakdown, fracture propagation and viscous fingers in liquids. V. (B) Irreversible growth models: diffusion-limited aggregation, dendritic growth, Eden model and cluster-cluster aggregation. VI. Kinetics of clustering. VII. Dynamical properties of fractal structures. VIII. Hierarchical and fractal features of disordered systems. IX. Chaos, turbulence and related topics.